Seven

You're chilling in your living room after a long day of work, when a small crack of iridescent green light parts the air. It grows before your eyes, gaining size and volume. The green mist becames so intense, blinding you for a second. When you open your eyes, the light is gone and a tall, mysterious stranger stands in the middle of the room. He wears a crystal armor with an almost radioactive glow (or maybe the glow comes from within himself?). He stares you down.